- A survey of a SNP (Single Nucleotide Polymorphism) site segregating
for nucleotides C and G in a chimpanzee population found
the following numbers of the different genotypes:
What is the frequency of G and what are the expected numbers
of the genotypes?
- Greg wanted to follow Mendel's experiments and was planting 100 pea
plants from parents that produce only round seeds
(we assume they were all homozygote) and 80 peas
from rough seed parents. Once he planted them, Greg
forgot which plant was which kind and therefore he pollinated
the plants at random. We assume he has a technique to recognize
heterozygotes.
- What are the genotype frequencies, and the allele frequencies in his
initial plant "population"?
- What are the genotype, and allele frequencies in the offspring?
- Using 100 seeds from his experiment and crossing them again (with themselves), what
are the genotype and allele frequencies?
- Would it make a difference if he was not able to distinguish between the heterozygotes and one of the homozygotes.
- A population survey for a microsatellite locus in a Drosphila
melanogasterpopulation resulted in
the following numbers of different genotypes:
|
A/A
|
A/B
|
A/C
|
B/B
|
B/C
|
C/C
|
|
8
|
38
|
121
|
27
|
252
|
401
|
What are the frequencies for all alleles
and what are the expected numbers
of the genotypes? What is the measured and expected
fraction of heterozygotes?
|